Not a lot of resources for those making coding for mobile devices, that I'm aware of. Having been involved in FlightGear's open source development for Window and Linux, the laptop and PC are still the main way to have improved graphics at a hobbyist's level.
I am surprised considering AeroFly's early reliance on OpenGL rendering that you haven't been checking out what is going on with FlightGear, as there is a big shift underway to leave their long in use Open Scene Graph rendering and change their rendering engine over to OpenGL, and the early screen shots are showing lots of promise.
So, FlightGear has had, for at least a near decade, a terrain and METAR reading programming using OSG's shader engine to make some of the most realistic and stunning weather/clouds and dynamic terrain and wind effects. Slope soaring in the Alps is very possible in FlightGear. Setting up the shock wave condensation at high AoA is just a matter of reading the local weather for humidity and having a property tree open enough that you can read the aircraft's attitude to it forward movement and speed.